How to create noisy, risograph-style gradients and textures in Photoshop in 3 ways 3 months

Risograph style, noisy gradients, spreckled gradient tutorials, I've researched them all but I couldn't find a good, free tutorial that explains properly how to create these styles in photoshop. So...

Sea is for Cookie over 2 years

Photoshop Battle on Great Wave off Kanagawa | via http://www.reddit.com/r/photoshopbattles/comments/1cfo34/great_wave_of_kanagawa_4335_2990/c9gd5k9